/* ==========================================================================
   RESET & BASE STYLES
   ========================================================================== */
*, *::before, *::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

:root {
  --bg-color: #0b0b0d;
  --text-main: #f4f3ef;
  --text-muted: #a3a099;
  --accent-gold: #d4af37;
  --envelope-bg: #161619;
  --envelope-border: rgba(255, 255, 255, 0.12);
  --font-serif: 'Cormorant Garamond', Georgia, serif;
  --font-sans: 'Plus Jakarta Sans', -apple-system, sans-serif;
  --transition-timing: cubic-bezier(0.645, 0.045, 0.355, 1);
}

html, body {
  width: 100%;
  height: 100%;
  overflow: hidden;
  background-color: var(--bg-color);
  color: var(--text-main);
  font-family: var(--font-sans);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

/* ==========================================================================
   3D STAGE & CUBE TRANSITION (CAPCUT STYLE 3D BOX ROTATION)
   ========================================================================== */
.stage-container {
  width: 100vw;
  height: 100dvh;
  perspective: 1400px;
  perspective-origin: 50% 50%;
  overflow: hidden;
  background-color: var(--bg-color);
}

.cube {
  width: 100%;
  height: 100%;
  position: relative;
  transform-style: preserve-3d;
  transition: transform 1.6s cubic-bezier(0.76, 0, 0.24, 1);
}

.cube-face {
  position: absolute;
  width: 100%;
  height: 100%;
  top: 0;
  left: 0;
  backface-visibility: hidden;
  display: flex;
  flex-direction: column;
  justify-content: center;
  align-items: center;
  overflow: hidden;
  background-color: var(--bg-color);
}

/* Cube Face Orientations */
/* Face 1: Front (Envelope) */
.face-envelope {
  transform: translateZ(50vw);
}

/* Face 2: Right side (Video) */
.face-video {
  transform: rotateY(90deg) translateZ(50vw);
  background: #000;
}

/* Face 3: Back side (Info) */
.face-info {
  transform: rotateY(180deg) translateZ(50vw);
}

/* Cube States (Rotation relative to viewing position) */
.cube.state-1 {
  transform: translateZ(-50vw) rotateY(0deg);
}

.cube.state-2 {
  transform: translateZ(-50vw) rotateY(-90deg);
}

.cube.state-3 {
  transform: translateZ(-50vw) rotateY(-180deg);
}

/* Dynamic Box Punch Keyframe Effect during transition */
@keyframes boxPunch {
  0% {
    transform: translateZ(-50vw) scale(1) rotateY(var(--from-rot));
  }
  35% {
    transform: translateZ(-75vw) scale(0.82) rotateY(var(--mid-rot));
  }
  100% {
    transform: translateZ(-50vw) scale(1) rotateY(var(--to-rot));
  }
}

.cube.animating-1-to-2 {
  --from-rot: 0deg;
  --mid-rot: -45deg;
  --to-rot: -90deg;
  animation: boxPunch 1.65s cubic-bezier(0.7, 0, 0.25, 1) forwards;
}

.cube.animating-2-to-3 {
  --from-rot: -90deg;
  --mid-rot: -135deg;
  --to-rot: -180deg;
  animation: boxPunch 1.65s cubic-bezier(0.7, 0, 0.25, 1) forwards;
}

/* ==========================================================================
   SCREEN 1: ENVELOPE (MINIMALIST & ELEGANT)
   ========================================================================== */
.envelope-wrapper {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  padding: 2rem;
  text-align: center;
  gap: 3rem;
  max-width: 480px;
  width: 100%;
}

.invitation-intro {
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
}

.sub-subtitle {
  font-family: var(--font-sans);
  font-size: 0.8rem;
  text-transform: uppercase;
  letter-spacing: 0.35em;
  color: var(--text-muted);
  font-weight: 400;
}

.invitation-heading {
  font-family: var(--font-serif);
  font-size: 2.8rem;
  font-weight: 300;
  letter-spacing: 0.02em;
  color: var(--text-main);
  line-height: 1.2;
}

/* Envelope Graphics & Animation */
.envelope-interactive {
  cursor: pointer;
  perspective: 600px;
  transition: transform 0.4s var(--transition-timing);
}

.envelope-interactive:hover {
  transform: translateY(-5px) scale(1.02);
}

.envelope {
  position: relative;
  width: 240px;
  height: 160px;
  background: var(--envelope-bg);
  border: 1px solid var(--envelope-border);
  border-radius: 4px;
  box-shadow: 0 20px 40px rgba(0, 0, 0, 0.6);
  display: flex;
  align-items: center;
  justify-content: center;
}

.envelope-flap {
  position: absolute;
  top: 0;
  left: 0;
  width: 0;
  height: 0;
  border-left: 120px solid transparent;
  border-right: 120px solid transparent;
  border-top: 95px solid #1f1f24;
  transform-origin: top;
  transition: transform 0.5s ease;
  z-index: 3;
}

.envelope-pocket {
  position: absolute;
  bottom: 0;
  left: 0;
  width: 0;
  height: 0;
  border-left: 120px solid #161619;
  border-right: 120px solid #161619;
  border-bottom: 95px solid #1c1c20;
  z-index: 2;
  border-radius: 0 0 4px 4px;
}

.envelope-letter {
  position: absolute;
  width: 210px;
  height: 120px;
  background: #222227;
  border-radius: 3px;
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 1;
  transition: transform 0.5s ease;
  border: 1px solid rgba(255, 255, 255, 0.05);
}

.letter-text {
  font-family: var(--font-serif);
  font-size: 1.1rem;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color: var(--text-muted);
}

.envelope-seal {
  position: absolute;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  width: 48px;
  height: 48px;
  background: #111113;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 4;
  color: var(--accent-gold);
  border: 1px solid rgba(212, 175, 55, 0.3);
  box-shadow: 0 4px 12px rgba(0, 0, 0, 0.4);
}

/* Hover state opening envelope preview */
.envelope-interactive:hover .envelope-flap {
  transform: rotateX(160deg);
  z-index: 0;
}

.envelope-interactive:hover .envelope-letter {
  transform: translateY(-25px);
}

.click-hint {
  font-size: 0.75rem;
  letter-spacing: 0.25em;
  text-transform: uppercase;
  color: var(--text-muted);
  opacity: 0.7;
}

/* ==========================================================================
   SCREEN 2: FULLSCREEN VIDEO (CLEAN & UNCLUTTERED)
   ========================================================================== */
.face-video video {
  width: 100%;
  height: 100%;
  object-fit: cover;
  display: block;
}

.skip-video-btn {
  position: absolute;
  bottom: 2rem;
  right: 2rem;
  background: rgba(0, 0, 0, 0.4);
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
  border: 1px solid rgba(255, 255, 255, 0.15);
  color: var(--text-main);
  padding: 0.6rem 1.2rem;
  border-radius: 40px;
  font-family: var(--font-sans);
  font-size: 0.75rem;
  letter-spacing: 0.15em;
  text-transform: uppercase;
  cursor: pointer;
  transition: all 0.3s ease;
  z-index: 10;
  opacity: 0.6;
}

.skip-video-btn:hover {
  opacity: 1;
  background: rgba(0, 0, 0, 0.8);
  border-color: rgba(255, 255, 255, 0.4);
}

/* ==========================================================================
   SCREEN 3: INFORMATION PAGE (MINIMALIST EDITORIAL STYLE)
   ========================================================================== */
.info-content {
  display: flex;
  flex-direction: column;
  align-items: center;
  text-align: center;
  max-width: 500px;
  width: 85%;
  padding: 2rem 0;
}

.info-tag {
  font-size: 0.75rem;
  text-transform: uppercase;
  letter-spacing: 0.3em;
  color: var(--text-muted);
  margin-bottom: 0.75rem;
}

.info-title {
  font-family: var(--font-serif);
  font-size: 3.2rem;
  font-weight: 300;
  letter-spacing: 0.03em;
  color: var(--text-main);
  margin-bottom: 2rem;
}

.divider {
  width: 40px;
  height: 1px;
  background-color: rgba(255, 255, 255, 0.2);
  margin: 1.5rem 0;
}

.info-details {
  display: flex;
  flex-direction: column;
  gap: 2rem;
  width: 100%;
  margin: 1rem 0;
}

.detail-group {
  display: flex;
  flex-direction: column;
  gap: 0.4rem;
}

.detail-label {
  font-size: 0.7rem;
  text-transform: uppercase;
  letter-spacing: 0.3em;
  color: var(--text-muted);
}

.detail-value {
  font-family: var(--font-serif);
  font-size: 2.2rem;
  font-weight: 400;
  color: var(--text-main);
  letter-spacing: 0.02em;
}

.info-actions {
  margin-top: 1.5rem;
}

.minimal-btn {
  display: inline-block;
  color: var(--text-main);
  text-decoration: none;
  font-size: 0.8rem;
  letter-spacing: 0.25em;
  text-transform: uppercase;
  padding: 0.9rem 2.2rem;
  border: 1px solid rgba(255, 255, 255, 0.25);
  border-radius: 0;
  transition: all 0.4s var(--transition-timing);
  position: relative;
  background: transparent;
}

.minimal-btn:hover {
  background: #ffffff;
  color: #000000;
  border-color: #ffffff;
}

/* Responsive adjust for mobile viewports */
@media (max-width: 600px) {
  .invitation-heading {
    font-size: 2.2rem;
  }

  .info-title {
    font-size: 2.5rem;
  }

  .detail-value {
    font-size: 1.8rem;
  }

  .envelope {
    width: 210px;
    height: 140px;
  }

  .envelope-flap {
    border-left-width: 105px;
    border-right-width: 105px;
    border-top-width: 80px;
  }

  .envelope-pocket {
    border-left-width: 105px;
    border-right-width: 105px;
    border-bottom-width: 80px;
  }

  .envelope-letter {
    width: 185px;
    height: 105px;
  }
}